Construction of a LiVO3/C core-shell structure for high-rate lithium storage

作者：Yang, Dizi; Zhang, Dongmei^*; Wu, Haihua^*; Pei, Cunyuan; Xiao, Ting; Ma, Huijuan; Ni, Shibing^*

来源：New Journal of Chemistry, 2023, 47(3): 1508-1516.

DOI：10.1039/d2nj05213j

• PERFORMANCE CATHODE MATERIAL
• ION BATTERY
• ANODE MATERIALS
• ELECTROCHEMICAL PERFORMANCE
• CARBON-SOURCES
• LI3VO4
• TEMPERATURE
• COMPOSITES
• INSERTION
• SHEETS

As an alternative anode material for lithium-ion batteries (LIBs), LiVO3 has shown great potential. We wished to fully reveal its potential for lithium storage. We introduced low-cost oxalic acid as a carbon source to construct a LiVO3/C core-shell structure. Employed as LIB anodes, the highly reversible specific capacity of LiVO3/C reached 776.0 mA h g(-1) after 200 cycles at 0.2 A g(-1). During five periods of rate testing at various current densities (0.2, 0.5, 1.0, 2.0, 5.0 A g(-1)), the average capacity of the LiVO3/C electrode was 365.8 mA h g(-1) at 5.0 A g(-1), and retained a high discharge capacity of 569.0 mA h g(-1) when the current was returned to 0.2 A g(-1). Impressively, the LiVO3/C anode presented an unprecedented high-rate long cycling performance of 205.0 mA h g(-1) at 10.0 A g(-1) after 2000 cycles. The unprecedented lithium-storage ability was attributed to the unique core-shell structure, in which all-around carbon encapsulation provided many interfaces, and enhanced the electron conductivity and structural consistency of the LiVO3/C electrode. Moreover, the adaptive reaction dynamics of the LiVO3/C electrode were documented. That is, the gradually increasing pseudocapacitance contribution and decreasing charge-transfer impedance upon cycling were the intrinsic drivers of the excellent rate performance. This work promotes further development of anode materials based on LiVO3.